Monochromatic Depolarizer Based on Liquid Crystal

Abstract

Polarization is a very useful parameter of a light beam in many optical measurements. Improvement of holographic systems requires optical elements which need a diffused and depolarized light beam. This paper describes a simple monochromatic depolarizer based on a pure vertically aligned liquid crystal without pretilt. In this work we present an extended description of depolarizer by analyzing its electro-optic properties measured in spatial and time domains with the use of crossed polarizers and polarimetric configurations. Crossed polarizers set-up provides information on spatial and temporal changes of microscopic textures while polarimetric measurement allows to measure voltage and time dependence of degree of polarization. Three different thicknesses, i.e., 5 μm, 10 μm and 15 μm have been manufactured in order to analyze another degree of freedom for this type of depolarizer device based on a liquid crystals’ material. Consideration of the light scattering capability of the cell is reported.

Optical Properties of a Tapered Optical Fiber Coated with Alkanes Doped with Fe3O4 Nanoparticles

“…A broader analysis of the optical properties of TOF with magnetic NPs mixture was carried out based on polarimetric studies. Using the first configuration of the set-up presented in Figure 6 and applying the measurement sequence shown schematically in Figure 8 , changes of the generated specific states of polarization were measured and Mueller matrices were further calculated at each of indicated positions of the magnet [ 39 , 40 ]. In Figure 11 , numbers from 0 to 4 indicate the positions at which the magnet was held, and the measurement was performed.…”

“…Calculated Mueller matrices consist of full information about the optical properties of the tested sample. By using the standard Lu-Chipman decomposition method, five main optical parameters, i.e., losses, depolarization, dichroism, optical rotation, and linear retardance were calculated [ 39 , 40 ]. Depolarization changes were not observed for this optical element, however, four remained parameters experienced significant changes.…”

Assessment of the honey purity by using imaging polarimetry technique

“…The result is that spectral and polarization information often provides independent features for detection of an object that has similar spectral characteristics as the background or is hidden in a cluttered environment. The cause for this is that either polarization is created by re ection of sun light upon a dielectric or metallic surface or by refraction of thermal emission at such a surface, or that light is depolarized by the target in a different way than its surrounding objects (Marc P, et al, 2019). Imaging polarimeter for target detection need to be fast and deliver real-time data.…”

Quantum Polarimetry

“…( 23) and ( 24) into a completely unpolarized component. The polarization scrambling methods mentioned are made to simulate ideal depolarizers (Lu and Loeber, 1975), with work continuing to be done in this field of depolarizer design (Ge et al, 2012;Kroh et al, 2021;Marć et al, 2019;Marco et al, 2021;Shaham and Eisenberg, 2011;Zhang et al, 2007). Nondeterministic polarization transformations do not affect the total intensity 𝑆 0 , only altering the polarization vector S. The nine remaining parameters of general nondeterministic ("depolarizing") Mueller matrices take the form of a 3 × 3 symmetric real matrix m and a real vector p with magnitude less than or equal to unity (Lu and Chipman, 1996):…”